Probing cosmology with astrophysical gravitational wave background

用天体物理引力波背景探测宇宙学

• 批准号: 20K22348
• 负责人: Vardanyan Valeri
• 金额: $ 1.75万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Research Activity Start-up
• 财政年份: 2020
• 资助国家: 日本
• 起止时间: 2020-09-11 至 2024-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-20K22348/
• 关键词: Cosmology; Gravitational Waves; Primordial black holes; Cross-Correlations; Multimessenger astronomy; Primordial GW; Large-scale Structure; Large Scale Strcuture; Gaussian Processes; Cross Correlation

The original goals of the research proposal have been already achieved. During the past 12 months I have worked on extensions of the proposed projects. I have completed a paper studying anisotropic gravitational-wave background originating from primordial black-hole binaries formed in the early universe, and have assessed the prospects of distinguishing the primordial and astrophysical origins of gravitational-wave binaries. Additionally, I have continued working on modeling the cross-correlations between resolved gravitation-wave sources and galaxies with the aim of testing gravity at cosmological scales, as well as establishing the origin of gravitational-wave binaries via measuring the linear bias of their spatial clustering.In addition to the main theme of the KAKENHI project, I have also worked on projects of indirect relevance to the main theme. Particularly, I have completed a paper exploring the prospects of generating magnetic fields in the early universe. The studied scenario is also relevant for gravitation-wave generation, and is of interest for future gravitational-wave experiments. I have also released a paper discussing possible tests of fundamental physics using GRBs, and have studied extensions of the LCDM model.I have completed research visits during which I have delivered invited talks based on the obtained results, as detailed at later sections of this report.

研究计划的最初目标已经实现。在过去的12个月里，我一直致力于拟议项目的扩展。我已经完成了一篇研究来自早期宇宙形成的原始黑洞双星的各向异性引力波背景的论文，并评估了区分引力波双星的原始和天体物理起源的前景。此外，我还继续研究已分辨的引力波源和星系之间的相互关系模型，目的是在宇宙尺度上测试重力，以及通过测量引力波双星空间集群的线性偏差来确定引力波双星的起源。除了KAKENHI项目的主题外，我还参与了与主题间接相关的项目。特别是，我已经完成了一篇论文，探索在早期宇宙中产生磁场的前景。所研究的场景也与引力波的产生有关，并对未来的引力波实验感兴趣。我还发表了一篇论文，讨论了利用伽马射线爆发进行基础物理测试的可能性，并研究了LCDM模型的扩展。我已经完成了研究访问，在此期间，我根据获得的结果发表了受邀演讲，详见本报告后面的部分。

项目成果

McMaster University/Perimeter Institute(カナダ)

麦克马斯特大学/周边研究所（加拿大）

Cosmological dynamics of multifield dark energy

• DOI: 10.1103/physrevd.106.023512
• 发表时间: 2022-01
• 期刊: Physical Review D
• 影响因子: 5
• 作者: J. R. Eskilt;Yashar Akrami;A. Solomon;V. Vardanyan

EXPLORING THE UNIVERSE WITH GRAVITATIONAL WAVES

用引力波探索宇宙

• 发表时间: 2021
• 作者: Oogi T.;Ishiyama T.;Prada F.;Sinha M.;Croton D.;Cora S. A. Uchuu collaboration;ν2GC collaboration;Yuya Tanizaki;Valeri Vardanyan
• 通讯作者: Valeri Vardanyan

Inspire account

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Cross-correlation of the astrophysical gravitational-wave background with galaxy clustering

天体物理引力波背景与星系团的互相关

• 发表时间: 2019
• 作者: G. Cañas;O. Contigiani;V. Vardanyan
• 通讯作者: V. Vardanyan